CVE-2026-22980

Ecosystem	Package	Version

Vulnerabilities

CVE-2026-22980

In the Linux kernel, the following vulnerability has been resolved: nfsd: provide locking for v4_end_grace Writing to v4_end_grace can race with server shutdown and result in memory being accessed after it was freed - reclaim_str_hashtbl in particularly. We cannot hold nfsd_mutex across the nfsd4_end_grace() call as that is held while client_tracking_op->init() is called and that can wait for an upcall to nfsdcltrack which can write to v4_end_grace, resulting in a deadlock. nfsd4_end_grace() is also called by the landromat work queue and this doesn't require locking as server shutdown will stop the work and wait for it before freeing anything that nfsd4_end_grace() might access. However, we must be sure that writing to v4_end_grace doesn't restart the work item after shutdown has already waited for it. For this we add a new flag protected with nn->client_lock. It is set only while it is safe to make client tracking calls, and v4_end_grace only schedules work while the flag is set with the spinlock held. So this patch adds a nfsd_net field "client_tracking_active" which is set as described. Another field "grace_end_forced", is set when v4_end_grace is written. After this is set, and providing client_tracking_active is set, the laundromat is scheduled. This "grace_end_forced" field bypasses other checks for whether the grace period has finished. This resolves a race which can result in use-after-free.

Published Jan 26, 2026

https://lore.kernel.org/linux-cve-announce/2026012347-CVE-2026-22980-6031@gregkh/

CVSS ScoreHigh

7.8


rpm	kernel	4.18.0-147.0.2.el8_1
rpm	kernel	4.18.0-147.0.3.el8_1
rpm	kernel	4.18.0-147.3.1.el8_1
rpm	kernel	4.18.0-147.5.1.el8_1
rpm	kernel	4.18.0-147.8.1.el8_1
rpm	kernel	4.18.0-147.el8
rpm	kernel	4.18.0-193.1.2.el8_2
rpm	kernel	4.18.0-193.13.2.el8_2
rpm	kernel	4.18.0-193.14.3.el8_2
rpm	kernel	4.18.0-193.19.1.el8_2
rpm	kernel	4.18.0-193.28.1.el8_2
rpm	kernel	4.18.0-193.6.3.el8_2
rpm	kernel	4.18.0-193.el8
rpm	kernel	4.18.0-240.1.1.el8_3
rpm	kernel	4.18.0-240.10.1.el8_3
rpm	kernel	4.18.0-240.15.1.el8_3
rpm	kernel	4.18.0-240.22.1.el8_3
rpm	kernel	4.18.0-240.8.1.el8_3
rpm	kernel	4.18.0-240.el8
rpm	kernel	4.18.0-293.el8
rpm	kernel	4.18.0-305.10.2.el8_4
rpm	kernel	4.18.0-305.12.1.el8_4
rpm	kernel	4.18.0-305.17.1.el8_4
rpm	kernel	4.18.0-305.19.1.el8_4
rpm	kernel	4.18.0-305.25.1.el8_4
rpm	kernel	4.18.0-305.3.1.el8_4
rpm	kernel	4.18.0-305.7.1.el8_4
rpm	kernel	4.18.0-305.el8
rpm	kernel	4.18.0-348.12.2.el8_5
rpm	kernel	4.18.0-348.2.1.el8_5
rpm	kernel	4.18.0-348.20.1.el8_5
rpm	kernel	4.18.0-348.23.1.el8_5
rpm	kernel	4.18.0-348.7.1.el8_5
rpm	kernel	4.18.0-348.el8
rpm	kernel	4.18.0-372.13.1.0.1.el8_6
rpm	kernel	4.18.0-372.13.1.0.2.el8_6
rpm	kernel	4.18.0-372.16.1.0.1.el8_6
rpm	kernel	4.18.0-372.16.1.0.2.el8_6
rpm	kernel	4.18.0-372.19.1.0.1.el8_6
rpm	kernel	4.18.0-372.19.1.0.2.el8_6
rpm	kernel	4.18.0-372.26.1.0.1.el8_6
rpm	kernel	4.18.0-372.26.1.0.2.el8_6
rpm	kernel	4.18.0-372.32.1.0.1.el8_6
rpm	kernel	4.18.0-372.32.1.0.2.el8_6
rpm	kernel	4.18.0-372.9.1.0.2.el8
rpm	kernel	4.18.0-372.9.1.el8
rpm	kernel	4.18.0-425.10.1.0.1.el8_7
rpm	kernel	4.18.0-425.10.1.el8_7
rpm	kernel	4.18.0-425.13.1.0.1.el8_7
rpm	kernel	4.18.0-425.13.1.el8_7

Ecosystem	Package	Version

CVE-2026-22980 | Components Impacted | Sonatype Guide | Sonatype Guide

Find vulnerabilities. Fix fast with AI.

CVE-2026-22980